Implement kubevirt loadbalancer service with unit tests

Change-Id: I1c29e75aa5196b497f8f12f1d182788e3d173244
(cherry picked from commit 870abf8c7a7904c5953e20807ee7c681d8b5cd0b)
diff --git a/apps/kubevirt-networking/app/src/main/java/org/onosproject/kubevirtnetworking/web/KubevirtLoadBalancerWebResource.java b/apps/kubevirt-networking/app/src/main/java/org/onosproject/kubevirtnetworking/web/KubevirtLoadBalancerWebResource.java
new file mode 100644
index 0000000..8fa61a2
--- /dev/null
+++ b/apps/kubevirt-networking/app/src/main/java/org/onosproject/kubevirtnetworking/web/KubevirtLoadBalancerWebResource.java
@@ -0,0 +1,52 @@
+/*
+ * Copyright 2021-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.kubevirtnetworking.web;
+
+import org.onosproject.kubevirtnetworking.api.KubevirtLoadBalancer;
+import org.onosproject.kubevirtnetworking.api.KubevirtLoadBalancerService;
+import org.onosproject.rest.AbstractWebResource;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.ws.rs.GET;
+import javax.ws.rs.Path;
+import javax.ws.rs.Produces;
+import javax.ws.rs.core.MediaType;
+import javax.ws.rs.core.Response;
+
+/**
+ * Handles REST API call for kubevirt load balancer.
+ */
+@Path("loadbalancer")
+public class KubevirtLoadBalancerWebResource extends AbstractWebResource {
+
+    protected final Logger log = LoggerFactory.getLogger(getClass());
+    private static final String LOAD_BALANCERS = "loadBalancers";
+
+    /**
+     * Returns set of all load balancers.
+     *
+     * @return 200 OK with set of all load balancers
+     * @onos.rsModel KubevirtLoadBalancers
+     */
+    @GET
+    @Produces(MediaType.APPLICATION_JSON)
+    public Response getLoadBalancers() {
+        KubevirtLoadBalancerService service = get(KubevirtLoadBalancerService.class);
+        final Iterable<KubevirtLoadBalancer> lbs = service.loadBalancers();
+        return ok(encodeArray(KubevirtLoadBalancer.class, LOAD_BALANCERS, lbs)).build();
+    }
+}
diff --git a/apps/kubevirt-networking/app/src/main/java/org/onosproject/kubevirtnetworking/web/KubevirtNetworkingCodecRegister.java b/apps/kubevirt-networking/app/src/main/java/org/onosproject/kubevirtnetworking/web/KubevirtNetworkingCodecRegister.java
index b8f27e3..0280c6a 100644
--- a/apps/kubevirt-networking/app/src/main/java/org/onosproject/kubevirtnetworking/web/KubevirtNetworkingCodecRegister.java
+++ b/apps/kubevirt-networking/app/src/main/java/org/onosproject/kubevirtnetworking/web/KubevirtNetworkingCodecRegister.java
@@ -19,6 +19,8 @@
 import org.onosproject.kubevirtnetworking.api.KubevirtFloatingIp;
 import org.onosproject.kubevirtnetworking.api.KubevirtHostRoute;
 import org.onosproject.kubevirtnetworking.api.KubevirtIpPool;
+import org.onosproject.kubevirtnetworking.api.KubevirtLoadBalancer;
+import org.onosproject.kubevirtnetworking.api.KubevirtLoadBalancerRule;
 import org.onosproject.kubevirtnetworking.api.KubevirtNetwork;
 import org.onosproject.kubevirtnetworking.api.KubevirtPort;
 import org.onosproject.kubevirtnetworking.api.KubevirtRouter;
@@ -27,6 +29,8 @@
 import org.onosproject.kubevirtnetworking.codec.KubevirtFloatingIpCodec;
 import org.onosproject.kubevirtnetworking.codec.KubevirtHostRouteCodec;
 import org.onosproject.kubevirtnetworking.codec.KubevirtIpPoolCodec;
+import org.onosproject.kubevirtnetworking.codec.KubevirtLoadBalancerCodec;
+import org.onosproject.kubevirtnetworking.codec.KubevirtLoadBalancerRuleCodec;
 import org.onosproject.kubevirtnetworking.codec.KubevirtNetworkCodec;
 import org.onosproject.kubevirtnetworking.codec.KubevirtPortCodec;
 import org.onosproject.kubevirtnetworking.codec.KubevirtRouterCodec;
@@ -63,6 +67,8 @@
         codecService.registerCodec(KubevirtFloatingIp.class, new KubevirtFloatingIpCodec());
         codecService.registerCodec(KubevirtSecurityGroup.class, new KubevirtSecurityGroupCodec());
         codecService.registerCodec(KubevirtSecurityGroupRule.class, new KubevirtSecurityGroupRuleCodec());
+        codecService.registerCodec(KubevirtLoadBalancer.class, new KubevirtLoadBalancerCodec());
+        codecService.registerCodec(KubevirtLoadBalancerRule.class, new KubevirtLoadBalancerRuleCodec());
 
         log.info("Started");
     }
@@ -78,6 +84,8 @@
         codecService.unregisterCodec(KubevirtFloatingIp.class);
         codecService.unregisterCodec(KubevirtSecurityGroup.class);
         codecService.unregisterCodec(KubevirtSecurityGroupRule.class);
+        codecService.unregisterCodec(KubevirtLoadBalancer.class);
+        codecService.unregisterCodec(KubevirtLoadBalancerRule.class);
 
         log.info("Stopped");
     }
diff --git a/apps/kubevirt-networking/app/src/main/java/org/onosproject/kubevirtnetworking/web/KubevirtNetworkingWebApplication.java b/apps/kubevirt-networking/app/src/main/java/org/onosproject/kubevirtnetworking/web/KubevirtNetworkingWebApplication.java
index 139b92d..45dcdae 100644
--- a/apps/kubevirt-networking/app/src/main/java/org/onosproject/kubevirtnetworking/web/KubevirtNetworkingWebApplication.java
+++ b/apps/kubevirt-networking/app/src/main/java/org/onosproject/kubevirtnetworking/web/KubevirtNetworkingWebApplication.java
@@ -30,7 +30,8 @@
                 KubevirtManagementWebResource.class,
                 KubevirtRouterWebResource.class,
                 KubevirtFloatingIpsWebResource.class,
-                KubevirtSecurityGroupWebResource.class
+                KubevirtSecurityGroupWebResource.class,
+                KubevirtLoadBalancerWebResource.class
         );
     }
 }